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MainPlace Mall Transformation Project 12126.001 <br />Table 1 - 2016 CBC Seismic Design Parameters <br />Categorization/Coeff <br />Site Longitude (decimal degrees) West <br />-117.869651 ° <br />Site Latitude (decimal degrees) North <br />33.7755050 <br />Site Class <br />D <br />Mapped Spectral Response Acceleration at 0.2s Period, SS <br />1.478g <br />Mapped Spectral Response Acceleration at 1s Period, S, <br />0.540g <br />Short Period Site Coefficient at 0.2s Period, Fa <br />1.0 <br />Long Period Site Coefficient at 1 s Period, F <br />1.5 <br />Adjusted Spectral Response Acceleration at 0.2s Period, Sms <br />1.478g <br />Adjusted Spectral Response Acceleration at 1s Period, Smi <br />0.810g <br />Design Spectral Response Acceleration at 0.2s Period, Sos <br />0.985g <br />Design Spectral Response Acceleration at 1s Period, SDI <br />0.540g <br />Site -adjusted geometric mean Peak Ground Acceleration, PGAM <br />0.530g <br />All were derived from the United States Geological Survey (USGS) web page: <br />http://earthquake.usgs.gov/designmaps/us/application.php <br />The USGS detailed report of the USGS design map is also included in Appendix C. <br />3.3 Liquefaction <br />The term liquefaction is generally referenced to loss of strength and stiffness in <br />soils due to build-up of pore water pressure when subject to cyclic or monotonic <br />loading. Both sandy and clayey soils are susceptible to loss of strength and <br />stiffness. In general, adverse effects of liquefaction or cyclic softening can <br />include sand boils, loss of bearing support for structural foundations, excessive <br />ground settlement, and seismically -induced lateral ground deformations. <br />As shown on the State of California Seismic Hazard Zones Map for the Orange <br />Quadrangle (CGS, 1998), the northern majority of the site is not located within an <br />area that has been identified by the State of California as being potentially <br />susceptible to liquefaction (Figure 5, Seismic Hazard Map). However, the <br />southernmost portion of the project site is located within an area that has been <br />identified by the State of California as being potentially susceptible to liquefaction <br />(Figure 5, Seismic Hazard Map). This generally coincides with the portion of the <br />project site where the historically shallowest groundwater depth is between 30 <br />8 <br />Leighton <br />